[FIX] Issues #79 compatible CTRL+P with firefox browser

addons/web/static/src/less/backend_theme/flectra_style.less

@@ -19,7 +19,11 @@ body {
 @media print {
     body {
         overflow: auto !important;
+        display: block !important;
+        .o_main {
+            display: block !important;
             .o_main_content {
+                display: block !important;
                 overflow: visible !important;
                 .o_content {
                     overflow: visible !important;
@@ -27,6 +31,7 @@ body {
             }
         }
     }
+}
 
 .o_web_client {
     background-color: #ffffff;
@@ -136,6 +141,29 @@ div.o_checkbox {
         outline: 1px solid @brand-primary;
     }
 }
+@media print {
+    .o_checkbox {
+        input[type="checkbox"] {
+            opacity: 1 !important;
+        }
+        input:disabled + span {
+            opacity: 0 !important;
+        }
+    }
+    .o_kanban_view {
+        display: block;
+        .o_kanban_record {
+            width: 100% !important;
+            margin: 0 !important;
+        }
+    }
+    .o_pivot {
+        overflow: unset !important;
+    }
+    .o_graph {
+        height: 500px !important;
+    }
+}
 .o_dialog_error.modal-body{
     .alert{
         color: #8a6d3b;

addons/web/static/src/less/backend_theme/form_view.less

@@ -47,6 +47,12 @@
             }
         }
     }
+    @media print {
+        border: 0 !important;
+        .nav-tabs {
+            border: 0 !important;
+        }
+    }
 }
 
 .o_form_view {
@@ -87,9 +93,11 @@
                 }
             }
         }
+        @media print {
+            border: 0 !important;
+        }
     }
     .o_form_statusbar {
-
         min-height: 34px;
         > .o_statusbar_status {
             > .o_arrow_button {

addons/web/static/src/less/backend_theme/list_view.less

@@ -12,10 +12,21 @@
     }
 
     @media print {
+        thead {
+            th.o_column_sortable {
+                position: unset;
+            }
+        }
+        tfoot {
+            border: 0;
+            display: table-footer-group;
+        }
+        .o_list_record_selector {
             .o_checkbox {
                 display: none;
             }
         }
+    }
 
     .o_group_pager {
         cursor: text;